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Syllabus

what is the meaning of quantisation of charge?

Show does the force between two point charges change if the dielectric constant

of the medium in which they are kept increase?

_{0}?A free proton and a free electron are placed in a uniform field. Which of the two

experience greater force and greater acceleration?

Difference between gravitational force and electrostatic force

Explain the formulae E = Sigma / Epsilon not.

E is the electric field vector.

Epsilon not is the specific inductive capacity or relative permittivity of vaccum.

Sigma = ? (doubt)

what is the dimensional formula of epsilon not?

what is N=nNa

Two similarly and equally charged identical metal spheres A and B repel each other with a force of 0.000002 N. A third identical sphere C is touched with A and then placed at the mid point between A nd B. What is the net electric force on C?

Three point charges of +2 microcoulomb,-3 microcoulomb and -3 microcoulomb are kept at the vertices A,B and C respectively of an equilateral triangle of side 20 cm.What should be the sign and magnitude of the charge to be placed at the mid point(M) of side BC so that the charge at A remains in equilibrium?

Two small particles each of mass m carrying positive charge each are attached to the ends of non conducting light thread of length of 2l. a third particle of mass 2m is attached at mid point of the thread. The whole system is placed on a smooth horizontal floor and the particle of mass 2m is given a velocity V.

q. the velocity centre of mass of the system is a)V b)V/2 c)V/4 PLEASE EXPLAIN.

A charge q is placed at the center of the line joining two equal charges Q. Show that the system of three charges will be in equilibrium if q = -Q/4.

derive an expression for potential energy of an electric dipole in a uniform electric field .

Q.9. A 5 m long pole of 3 kg mass is placed against a smooth vertical well as shown in the figure. Under equilibrium condition, if the pole makes an angle of 37$\xb0$ with the horizontal, the frictional force between the pole and horizontal surface is

A) 20 N

B) 30 N

C) 20 $\mu $N

D) 30 $\mu $N

An infinite number of charges each equal to q are placed along x axis at x=1 , x=2 , x=4, x=8 and so on . Find the electric field at the point where x=0 due to this setup of charges and what will be the electric field if inthe above setup the consecutive charges have opposite sign.?

what does q1+q2 =0 signify in electrostatics?

difference between uniform and non-uniform electric fields.... plzz if possible draw diagrams too..!

a gas is heated through 1 degree celsius in a closed vessel. its pressure is increased by 0.4%.the initial temperature of the gas is ????

Two point charges one 4 times as strong as the other are placed at a certain distance apart in air. The force between them is 0.4 N. When the distance between them is decreased by 10 cm, the force is increased by 0.5 N. Calculate the charges and their original separation.A charge "q" is placed at the centre of the cube of side "l". What is the electric flux passing through each face of the cube?

Q.4. Gauss's law should be invalid, if

(a) there were magnetic monopoles

(b) the inverse square law were not exactly true

(c) the velocity of light were not a universal constant

(d) None of the above

Pls provide chart for values of Sin, Cos, Tan and Cot for specific values from 30 degrees to 360 degrees.

why do electrostatic experiments not work well on humid days

Â What is quantisation of charge?

What will be the value of electric field at the centre of electric dipole?(a)Zero

(b)Equal to the electric field due to one charge at centre

(c)Twice the electric field due to one charge at centre

(d)half the value of electric field due to one charge at centre.

What are the limitations of Coulomb's Law ?

Electric field strength, E=V/r what is V and r

A pendulum bob of mass of 80 mg and carrying a charge of 2 X 10

^{-}^{8}C is at rest in a horizontal uniform electric field of 20,000 V/m. Find the tension in the thread of the pendulum and the angle it makes with the vertical.Take( g = 9.8ms

^{-2})Four charges, each equal to Q are placed at the 4 corners of a square and a charge q is placed at the centre of the square. If the system is in equilibrium, then the value of q is?

name the system for which electric field at distances 1cm,2cm,3cm are in the ratio 1:1/8:1/27

two equal point charges A and B are R distance apart. A third point charge placed on the prependicular bisector at a distance 'd' from the center will experience maximum electrostatic force when

1. d = R/2 X 1.414

2 d = R/ 1.414

3. d = R 1.414

4. d = 2 X 1.414 R

Three charges each equal to q are placed at the three corners of a square of side a. Find the electric field at the fourth corner.

when a body becmes negatively charged , its mass

[a] decreases [b] increases

[c] remins the same [d] none of these

a semi infinite line charge of linear charge density 'D' has the shape of an infinitely long straight wire whose one end is connected to three-fourth circle of radius 'R' while one of the diameters of 3/4th circle is parallel to the infinitely long straight part.What is the field at the centre of the circle.How?

q. Two point charges of +16 micro coulomb and -9 micro coulomb are placed 8 cm apart in air .Determine the position of the point at which the resultant field is zero .

why the electrons flow from the ground to the sphere when we trying to charge a metal sphere negatively?

Two small balls having equal positive charge q coulomb are suspended by two insulating strings of equal length ' l ' meter from hook fixed to stand.The whole setup is taken in a satellite into sapce where there is no gravity. What is the angle between the two strings and the tension in each string?

what is the source charge and test charge

an electric dipole of dipole moment 20 *10

^{-6}Cm is enclosed by a closed surface .what is the net flux coming out of the surface?2 point charges at distance ' r ' in air exert a force ' F ' on each other, at what distance will these charges experience the same force ' F' in a medium of dielectric constant K?

two fixed point charges +4e and +e units are separated by a distance a .where should the third point charge be placed for it to be in equilibrium ?

if a dipole of charge 2 micro coloumb is placed inside a sphere of radius 2m,what is the net flux linked with the sphere.

how much positive and negative charge is there in a cup of water

Two infinitely long parallel wires having linear charge densities λ1 and λ2 respectively are placed at a distance of R metre. The force per unit length on either wire will be.......?

what is the direction of electric field at the surface of a charged conductor having charge density Ïƒ < 0.

_{1}, Q_{2}, Q_{3}, respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, Q_{1}: Q_{2}: Q_{3}is : (1) 1 : 2 : 3 (2) 1 : 3 : 5 (3) 1 : 4 : 9 (4) 1 : 8 : 18radius R.If the radius is reduced to half, how would the electric flux through the surface

changes?

what is the principle of vernier calipers

electrostatic field lines cannot be discontinuous why?

An electron falls through a distance of 1.5 cm in a uniform electric field of magnitude 2.0 Ã— 10

^{4}N C^{â€“1}in the direction of the field . Then the direction of the field is reversed keeping its magnitude unchanged and a proton falls through the same distance . compute the time of fall in each case.A charged rod P attracts rod R where as P repels another charged rod Q. What

type of force is developed between Q and R?

state Gauss' law in electrostatics.

what is the work done by an electric field in rotating a dipole from its unstable equilibrium to stable equilibrium? does the energy of dipole increase or decrease in this process why?

project to study various factors on which the internal resistance emf of a cell depends

Find (i) the force on the charge at the centre of shell and at the point A. (ii) the electric flux through the shell.

State and prove

.Gauss TheoremWhat is the angle between the directions of electric field at any 1) axial point 2) equatorial point due to an electric dipole ?

what are the physical significance of electric field??

deduce the expression for the potential energy of a system of two point charges q1 and q2 brought from infinity to the points r1

^{vector}and r2^{vector}respectivelyin the presence of external fieldE^{vector.}the sum of two point charges is 7uC. they repel each other with a force of 1N when kept 30cm apart in free space. calculate the value of each charge.

what is the dimensional formula of potential gradient?

If E=6i+3j+4k, calculate the electric flux through a surface of area 20 units in the YZ plane.

$V\left(r\right)=K{r}^{3},\left(K0\right)$

(i) For what energy and angular momentum will the orbit be a circle of radius a about the origin?

(ii) What is the period of this circular motion?

HOW TO DO THIS QUESTION?

The electric field components due to a charge inside the cube of side 0.1 m are as shown:

Where α = 500 N/C − m

E_{y}= 0,E_{z}= 0Calculate (i) the flux through the cube and (ii) the charge inside the cube

what is the difference between a point charge and a test charge?

explain cyclotron in a more elaborate way

A certain charge Q is divided into two parts q and Q-q which are then seperated by a certain distance.What must q be iin terms of Qto maximise the electrostatics repulsion between the two charges?

Q: two spheres of charges +10C&+40C are placed 0.12m apart.find the position of the point ,between them ,where the force on a charge "q" is zero?

ans -0.04m from +10C

PLZ TELL ME HOW THE ANSWER IS 0.04m FROM +10C?

MY ANSWER DIFFERS FROM IT.

^{0}South of West^{0}South of East^{0}South of West^{0}South of EastWhy does the electric field inside a dielectric decrease when it is placed in an external electric field?

covered cork balls of 1.5 x 10-4kg each suspended by threads 10 cm long (see Fig.).When equal electric

charges are placed on the balls, the electric repulsive force pushes them apart, and the angle between the

threads indicates the magnitude of the electric charge. If the equilibrium angle between the threads is

60degree, what is the magnitude

a car moving with a speed of 40km/hr can be stopped by applying brakes after at least 2m.If the same car is moving with 80km/hr.What is the least stopping distance?

A charged drop of oil of radius 2.76 micro C and density 920 kg / m

^{3}is held stationary in a vertically downward electric field of 1.65 * 10^{6}NC^{-1}.(1) Find the magnitude and sign of charge on the drop.

(2) If the drop captures two electrons in the same electric field , what would be its acceleration ?

Ignore viscous drag.

why is coulombs law applicable only to point charges?